A Hybird Self-embedding Bi-watermarking Algorithm

Based on discrete wavelet transform,a new hybrid image authentication watermark obtained as a combination of a fragile and a robust watermark is presented.The high 6 bits of original image is discrete wavelet transform,then recovery watermark to be obtained from low-frequency wavelet coefficients to be quantized and chaoic scrambling is embedded into the Hypo-LSB of image.The small volume of information is embedded into LSB of original image.And from this authentication watermarking is generated.Experiments result shows that the proposed algorithm cannot only locate tampered blocks accurately,but also restore tampered content region.